n.无力；无效；性无能

Skin, bones and internal organs are used to make traditional medicines touted to cure anything from arthritis to impotency. 皮，骨头和内部器官被用于生产传统医药用于治疗从关节炎到无力多重疾病。

Increasing use of birth control pills is also contributing towards rising impotency, he said. 他说，性无能人口比例增加的另一个原因是避孕药的大量使用。